The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/elf_common.h

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    1 /*-
    2  * Copyright (c) 1998 John D. Polstra.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: src/sys/sys/elf_common.h,v 1.15 2004/05/05 02:38:54 marcel Exp $
   27  */
   28 
   29 #ifndef _SYS_ELF_COMMON_H_
   30 #define _SYS_ELF_COMMON_H_ 1
   31 
   32 /*
   33  * ELF definitions that are independent of architecture or word size.
   34  */
   35 
   36 /*
   37  * Note header.  The ".note" section contains an array of notes.  Each
   38  * begins with this header, aligned to a word boundary.  Immediately
   39  * following the note header is n_namesz bytes of name, padded to the
   40  * next word boundary.  Then comes n_descsz bytes of descriptor, again
   41  * padded to a word boundary.  The values of n_namesz and n_descsz do
   42  * not include the padding.
   43  */
   44 
   45 typedef struct {
   46         u_int32_t       n_namesz;       /* Length of name. */
   47         u_int32_t       n_descsz;       /* Length of descriptor. */
   48         u_int32_t       n_type;         /* Type of this note. */
   49 } Elf_Note;
   50 
   51 /* Indexes into the e_ident array.  Keep synced with 
   52    http://www.sco.com/developer/gabi/ch4.eheader.html */
   53 #define EI_MAG0         0       /* Magic number, byte 0. */
   54 #define EI_MAG1         1       /* Magic number, byte 1. */
   55 #define EI_MAG2         2       /* Magic number, byte 2. */
   56 #define EI_MAG3         3       /* Magic number, byte 3. */
   57 #define EI_CLASS        4       /* Class of machine. */
   58 #define EI_DATA         5       /* Data format. */
   59 #define EI_VERSION      6       /* ELF format version. */
   60 #define EI_OSABI        7       /* Operating system / ABI identification */
   61 #define EI_ABIVERSION   8       /* ABI version */
   62 #define OLD_EI_BRAND    8       /* Start of architecture identification. */
   63 #define EI_PAD          9       /* Start of padding (per SVR4 ABI). */
   64 #define EI_NIDENT       16      /* Size of e_ident array. */
   65 
   66 /* Values for the magic number bytes. */
   67 #define ELFMAG0         0x7f
   68 #define ELFMAG1         'E'
   69 #define ELFMAG2         'L'
   70 #define ELFMAG3         'F'
   71 #define ELFMAG          "\177ELF"       /* magic string */
   72 #define SELFMAG         4               /* magic string size */
   73 
   74 /* Values for e_ident[EI_VERSION] and e_version. */
   75 #define EV_NONE         0
   76 #define EV_CURRENT      1
   77 
   78 /* Values for e_ident[EI_CLASS]. */
   79 #define ELFCLASSNONE    0       /* Unknown class. */
   80 #define ELFCLASS32      1       /* 32-bit architecture. */
   81 #define ELFCLASS64      2       /* 64-bit architecture. */
   82 
   83 /* Values for e_ident[EI_DATA]. */
   84 #define ELFDATANONE     0       /* Unknown data format. */
   85 #define ELFDATA2LSB     1       /* 2's complement little-endian. */
   86 #define ELFDATA2MSB     2       /* 2's complement big-endian. */
   87 
   88 /* Values for e_ident[EI_OSABI]. */
   89 #define ELFOSABI_SYSV           0       /* UNIX System V ABI */
   90 #define ELFOSABI_NONE           ELFOSABI_SYSV   /* symbol used in old spec */
   91 #define ELFOSABI_HPUX           1       /* HP-UX operating system */
   92 #define ELFOSABI_NETBSD         2       /* NetBSD */
   93 #define ELFOSABI_LINUX          3       /* GNU/Linux */
   94 #define ELFOSABI_HURD           4       /* GNU/Hurd */
   95 #define ELFOSABI_86OPEN         5       /* 86Open common IA32 ABI */
   96 #define ELFOSABI_SOLARIS        6       /* Solaris */
   97 #define ELFOSABI_MONTEREY       7       /* Monterey */
   98 #define ELFOSABI_IRIX           8       /* IRIX */
   99 #define ELFOSABI_FREEBSD        9       /* FreeBSD */
  100 #define ELFOSABI_TRU64          10      /* TRU64 UNIX */
  101 #define ELFOSABI_MODESTO        11      /* Novell Modesto */
  102 #define ELFOSABI_OPENBSD        12      /* OpenBSD */
  103 #define ELFOSABI_ARM            97      /* ARM */
  104 #define ELFOSABI_STANDALONE     255     /* Standalone (embedded) application */
  105 
  106 /* e_ident */
  107 #define IS_ELF(ehdr)    ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
  108                          (ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
  109                          (ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
  110                          (ehdr).e_ident[EI_MAG3] == ELFMAG3)
  111 
  112 /* Values for e_type. */
  113 #define ET_NONE         0       /* Unknown type. */
  114 #define ET_REL          1       /* Relocatable. */
  115 #define ET_EXEC         2       /* Executable. */
  116 #define ET_DYN          3       /* Shared object. */
  117 #define ET_CORE         4       /* Core file. */
  118 
  119 /* Values for e_machine. */
  120 #define EM_NONE         0       /* Unknown machine. */
  121 #define EM_M32          1       /* AT&T WE32100. */
  122 #define EM_SPARC        2       /* Sun SPARC. */
  123 #define EM_386          3       /* Intel i386. */
  124 #define EM_68K          4       /* Motorola 68000. */
  125 #define EM_88K          5       /* Motorola 88000. */
  126 #define EM_486          6       /* Intel i486. */
  127 #define EM_860          7       /* Intel i860. */
  128 #define EM_MIPS         8       /* MIPS R3000 Big-Endian only */
  129 
  130 /* Extensions.  This list is not complete. */
  131 #define EM_S370         9       /* IBM System/370 */
  132 #define EM_MIPS_RS4_BE  10      /* MIPS R4000 Big-Endian */ /* Depreciated */
  133 #define EM_PARISC       15      /* HPPA */
  134 #define EM_SPARC32PLUS  18      /* SPARC v8plus */
  135 #define EM_PPC          20      /* PowerPC 32-bit */
  136 #define EM_PPC64        21      /* PowerPC 64-bit */
  137 #define EM_ARM          40      /* ARM */
  138 #define EM_SPARCV9      43      /* SPARC v9 64-bit */
  139 #define EM_IA_64        50      /* Intel IA-64 Processor */
  140 #define EM_X86_64       62      /* Advanced Micro Devices x86-64 */
  141 #define EM_ALPHA        0x9026  /* Alpha (written in the absence of an ABI */
  142 
  143 /* Special section indexes. */
  144 #define SHN_UNDEF            0          /* Undefined, missing, irrelevant. */
  145 #define SHN_LORESERVE   0xff00          /* First of reserved range. */
  146 #define SHN_LOPROC      0xff00          /* First processor-specific. */
  147 #define SHN_HIPROC      0xff1f          /* Last processor-specific. */
  148 #define SHN_ABS         0xfff1          /* Absolute values. */
  149 #define SHN_COMMON      0xfff2          /* Common data. */
  150 #define SHN_HIRESERVE   0xffff          /* Last of reserved range. */
  151 
  152 /* sh_type */
  153 #define SHT_NULL        0               /* inactive */
  154 #define SHT_PROGBITS    1               /* program defined information */
  155 #define SHT_SYMTAB      2               /* symbol table section */
  156 #define SHT_STRTAB      3               /* string table section */
  157 #define SHT_RELA        4               /* relocation section with addends */
  158 #define SHT_HASH        5               /* symbol hash table section */
  159 #define SHT_DYNAMIC     6               /* dynamic section */ 
  160 #define SHT_NOTE        7               /* note section */
  161 #define SHT_NOBITS      8               /* no space section */
  162 #define SHT_REL         9               /* relocation section - no addends */
  163 #define SHT_SHLIB       10              /* reserved - purpose unknown */
  164 #define SHT_DYNSYM      11              /* dynamic symbol table section */ 
  165 #define SHT_NUM         12              /* number of section types */
  166 #define SHT_LOOS        0x60000000      /* First of OS specific semantics */
  167 #define SHT_HIOS        0x6fffffff      /* Last of OS specific semantics */
  168 #define SHT_LOPROC      0x70000000      /* reserved range for processor */
  169 #define SHT_HIPROC      0x7fffffff      /* specific section header types */
  170 #define SHT_LOUSER      0x80000000      /* reserved range for application */
  171 #define SHT_HIUSER      0xffffffff      /* specific indexes */
  172 
  173 /* Flags for sh_flags. */
  174 #define SHF_WRITE       0x1             /* Section contains writable data. */
  175 #define SHF_ALLOC       0x2             /* Section occupies memory. */
  176 #define SHF_EXECINSTR   0x4             /* Section contains instructions. */
  177 #define SHF_TLS         0x400           /* Section contains TLS data. */
  178 #define SHF_MASKPROC    0xf0000000      /* Reserved for processor-specific. */
  179 
  180 /* Values for p_type. */
  181 #define PT_NULL         0       /* Unused entry. */
  182 #define PT_LOAD         1       /* Loadable segment. */
  183 #define PT_DYNAMIC      2       /* Dynamic linking information segment. */
  184 #define PT_INTERP       3       /* Pathname of interpreter. */
  185 #define PT_NOTE         4       /* Auxiliary information. */
  186 #define PT_SHLIB        5       /* Reserved (not used). */
  187 #define PT_PHDR         6       /* Location of program header itself. */
  188 #define PT_TLS          7       /* Thread local storage segment */
  189 
  190 #define PT_COUNT        8       /* Number of defined p_type values. */
  191 
  192 #define PT_LOOS         0x60000000      /* OS-specific */
  193 #define PT_HIOS         0x6fffffff      /* OS-specific */
  194 #define PT_LOPROC       0x70000000      /* First processor-specific type. */
  195 #define PT_HIPROC       0x7fffffff      /* Last processor-specific type. */
  196 
  197 /* Values for p_flags. */
  198 #define PF_X            0x1     /* Executable. */
  199 #define PF_W            0x2     /* Writable. */
  200 #define PF_R            0x4     /* Readable. */
  201 
  202 /* Values for d_tag. */
  203 #define DT_NULL         0       /* Terminating entry. */
  204 #define DT_NEEDED       1       /* String table offset of a needed shared
  205                                    library. */
  206 #define DT_PLTRELSZ     2       /* Total size in bytes of PLT relocations. */
  207 #define DT_PLTGOT       3       /* Processor-dependent address. */
  208 #define DT_HASH         4       /* Address of symbol hash table. */
  209 #define DT_STRTAB       5       /* Address of string table. */
  210 #define DT_SYMTAB       6       /* Address of symbol table. */
  211 #define DT_RELA         7       /* Address of ElfNN_Rela relocations. */
  212 #define DT_RELASZ       8       /* Total size of ElfNN_Rela relocations. */
  213 #define DT_RELAENT      9       /* Size of each ElfNN_Rela relocation entry. */
  214 #define DT_STRSZ        10      /* Size of string table. */
  215 #define DT_SYMENT       11      /* Size of each symbol table entry. */
  216 #define DT_INIT         12      /* Address of initialization function. */
  217 #define DT_FINI         13      /* Address of finalization function. */
  218 #define DT_SONAME       14      /* String table offset of shared object
  219                                    name. */
  220 #define DT_RPATH        15      /* String table offset of library path. [sup] */
  221 #define DT_SYMBOLIC     16      /* Indicates "symbolic" linking. [sup] */
  222 #define DT_REL          17      /* Address of ElfNN_Rel relocations. */
  223 #define DT_RELSZ        18      /* Total size of ElfNN_Rel relocations. */
  224 #define DT_RELENT       19      /* Size of each ElfNN_Rel relocation. */
  225 #define DT_PLTREL       20      /* Type of relocation used for PLT. */
  226 #define DT_DEBUG        21      /* Reserved (not used). */
  227 #define DT_TEXTREL      22      /* Indicates there may be relocations in
  228                                    non-writable segments. [sup] */
  229 #define DT_JMPREL       23      /* Address of PLT relocations. */
  230 #define DT_BIND_NOW     24      /* [sup] */
  231 #define DT_INIT_ARRAY   25      /* Address of the array of pointers to
  232                                    initialization functions */
  233 #define DT_FINI_ARRAY   26      /* Address of the array of pointers to
  234                                    termination functions */
  235 #define DT_INIT_ARRAYSZ 27      /* Size in bytes of the array of
  236                                    initialization functions. */
  237 #define DT_FINI_ARRAYSZ 28      /* Size in bytes of the array of
  238                                    terminationfunctions. */
  239 #define DT_RUNPATH      29      /* String table offset of a null-terminated
  240                                    library search path string. */
  241 #define DT_FLAGS        30      /* Object specific flag values. */
  242 #define DT_ENCODING     32      /* Values greater than or equal to DT_ENCODING
  243                                    and less than DT_LOOS follow the rules for
  244                                    the interpretation of the d_un union
  245                                    as follows: even == 'd_ptr', even == 'd_val'
  246                                    or none */
  247 #define DT_PREINIT_ARRAY 32     /* Address of the array of pointers to
  248                                    pre-initialization functions. */
  249 #define DT_PREINIT_ARRAYSZ 33   /* Size in bytes of the array of
  250                                    pre-initialization functions. */
  251 
  252 #define DT_COUNT        33      /* Number of defined d_tag values. */
  253 
  254 #define DT_LOOS         0x6000000d      /* First OS-specific */
  255 #define DT_HIOS         0x6fff0000      /* Last OS-specific */
  256 #define DT_LOPROC       0x70000000      /* First processor-specific type. */
  257 #define DT_HIPROC       0x7fffffff      /* Last processor-specific type. */
  258 
  259 /* Values for DT_FLAGS */
  260 #define DF_ORIGIN       0x0001  /* Indicates that the object being loaded may
  261                                    make reference to the $ORIGIN substitution
  262                                    string */
  263 #define DF_SYMBOLIC     0x0002  /* Indicates "symbolic" linking. */
  264 #define DF_TEXTREL      0x0004  /* Indicates there may be relocations in
  265                                    non-writable segments. */
  266 #define DF_BIND_NOW     0x0008  /* Indicates that the dynamic linker should
  267                                    process all relocations for the object
  268                                    containing this entry before transferring
  269                                    control to the program. */
  270 #define DF_STATIC_TLS   0x0010  /* Indicates that the shared object or
  271                                    executable contains code using a static
  272                                    thread-local storage scheme. */
  273 
  274 /* Values for n_type.  Used in core files. */
  275 #define NT_PRSTATUS     1       /* Process status. */
  276 #define NT_FPREGSET     2       /* Floating point registers. */
  277 #define NT_PRPSINFO     3       /* Process state info. */
  278 
  279 /* Symbol Binding - ELFNN_ST_BIND - st_info */
  280 #define STB_LOCAL       0       /* Local symbol */
  281 #define STB_GLOBAL      1       /* Global symbol */
  282 #define STB_WEAK        2       /* like global - lower precedence */
  283 #define STB_LOPROC      13      /* reserved range for processor */
  284 #define STB_HIPROC      15      /*  specific symbol bindings */
  285 
  286 /* Symbol type - ELFNN_ST_TYPE - st_info */
  287 #define STT_NOTYPE      0       /* Unspecified type. */
  288 #define STT_OBJECT      1       /* Data object. */
  289 #define STT_FUNC        2       /* Function. */
  290 #define STT_SECTION     3       /* Section. */
  291 #define STT_FILE        4       /* Source file. */
  292 #define STT_TLS         6       /* TLS object. */
  293 #define STT_LOPROC      13      /* reserved range for processor */
  294 #define STT_HIPROC      15      /*  specific symbol types */
  295 
  296 /* Special symbol table indexes. */
  297 #define STN_UNDEF       0       /* Undefined symbol index. */
  298 
  299 #endif /* !_SYS_ELF_COMMON_H_ */

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